/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2007 Oracle. All rights reserved.
*/
#ifndef BTRFS_ORDERED_DATA_H
#define BTRFS_ORDERED_DATA_H
#include <linux/types.h>
#include <linux/list.h>
#include <linux/refcount.h>
#include <linux/completion.h>
#include <linux/rbtree.h>
#include <linux/wait.h>
#include "async-thread.h"
struct inode;
struct page;
struct extent_state;
struct btrfs_inode;
struct btrfs_root;
struct btrfs_fs_info;
struct btrfs_ordered_sum {
/*
* Logical start address and length for of the blocks covered by
* the sums array.
*/
u64 logical;
u32 len;
struct list_head list;
/* last field is a variable length array of csums */
u8 sums[];
};
/*
* Bits for btrfs_ordered_extent::flags.
*
* BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
* It is used to make sure metadata is inserted into the tree only once
* per extent.
*
* BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
* rbtree, just before waking any waiters. It is used to indicate the
* IO is done and any metadata is inserted into the tree.
*/
enum {
/*
* Different types for ordered extents, one and only one of the 4 types
* need to be set when creating ordered extent.
*
* REGULAR: For regular non-compressed COW write
* NOCOW: For NOCOW write into existing non-hole extent
* PREALLOC: For NOCOW write into preallocated extent
* COMPRESSED: For compressed COW write
*/
BTRFS_ORDERED_REGULAR,
BTRFS_ORDERED_NOCOW,
BTRFS_ORDERED_PREALLOC,
BTRFS_ORDERED_COMPRESSED,
/*
* Extra bit for direct io, can only be set for
* REGULAR/NOCOW/PREALLOC. No direct io for compressed extent.
*/
BTRFS_ORDERED_DIRECT,
/* Extra status bits for ordered extents */
/* set when all the pages are written */
BTRFS_ORDERED_IO_DONE,
/* set when removed from the tree */
BTRFS_ORDERED_COMPLETE,
/* We had an io error when writing this out */
BTRFS_ORDERED_IOERR,
/* Set when we have to truncate an extent */
BTRFS_ORDERED_TRUNCATED,
/* Used during fsync to track already logged extents */
BTRFS_ORDERED_LOGGED,
/* We have already logged all the csums of the ordered extent */
BTRFS_ORDERED_LOGGED_CSUM,
/* We wait for this extent to complete in the current transaction */
BTRFS_ORDERED_PENDING,
/* BTRFS_IOC_ENCODED_WRITE */
BTRFS_ORDERED_ENCODED,
};
/* BTRFS_ORDERED_* flags that specify the type of the extent. */
#define BTRFS_ORDERED_TYPE_FLAGS ((1UL << BTRFS_ORDERED_REGULAR) | \
(1UL << BTRFS_ORDERED_NOCOW) | \
(1UL << BTRFS_ORDERED_PREALLOC) | \
(1UL << BTRFS_ORDERED_COMPRESSED) | \
(1UL << BTRFS_ORDERED_DIRECT) | \
(1UL << BTRFS_ORDERED_ENCODED))
struct btrfs_ordered_extent {
/* logical offset in the file */
u64 file_offset;
/*
* These fields directly correspond to the same fields in
* btrfs_file_extent_item.
*/
u64 num_bytes;
u64 ram_bytes;
u64 disk_bytenr;
u64 disk_num_bytes;
u64 offset;
/* number of bytes that still need writing */
u64 bytes_left;
/*
* If we get truncated we need to adjust the file extent we enter for
* this ordered extent so that we do not expose stale data.
*/
u64 truncated_len;
/* flags (described above) */
unsigned long flags;
/* compression algorithm */
int compress_type;
/* Qgroup reserved space */
int qgroup_rsv;
/* reference count */
refcount_t refs;
/* the inode we belong to */
struct btrfs_inode *inode;
/* list of checksums for insertion when the extent io is done */
struct list_head list;
/* used for fast fsyncs */
struct list_head log_list;
/* used to wait for the BTRFS_ORDERED_COMPLETE bit */
wait_queue_head_t wait;
/* our friendly rbtree entry */
struct rb_node rb_node;
/* a per root list of all the pending ordered extents */
struct list_head root_extent_list;
struct btrfs_work work;
struct completion completion;
struct btrfs_work flush_work;
struct list_head work_list;
struct list_head bioc_list;
};
int btrfs_finish_one_ordered(struct btrfs_ordered_extent *ordered_extent);
int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent);
void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
void btrfs_remove_ordered_extent(struct btrfs_inode *btrfs_inode,
struct btrfs_ordered_extent *entry);
void btrfs_finish_ordered_extent(struct btrfs_ordered_extent *ordered,
struct folio *folio, u64 file_offset, u64 len,
bool uptodate);
void btrfs_mark_ordered_io_finished(struct btrfs_inode *inode,
struct folio *folio, u64 file_offset,
u64 num_bytes, bool uptodate);
bool btrfs_dec_test_ordered_pending(struct btrfs_inode *inode,
struct btrfs_ordered_extent **cached,
u64 file_offset, u64 io_size);
/*
* This represents details about the target file extent item of a write operation.
*/
struct btrfs_file_extent {
u64 disk_bytenr;
u64 disk_num_bytes;
u64 num_bytes;
u64 ram_bytes;
u64 offset;
u8 compression;
};
struct btrfs_ordered_extent *btrfs_alloc_ordered_extent(
struct btrfs_inode *inode, u64 file_offset,
const struct btrfs_file_extent *file_extent, unsigned long flags);
void btrfs_add_ordered_sum(struct btrfs_ordered_extent *entry,
struct btrfs_ordered_sum *sum);
struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct btrfs_inode *inode,
u64 file_offset);
void btrfs_start_ordered_extent(struct btrfs_ordered_extent *entry);
int btrfs_wait_ordered_range(struct btrfs_inode *inode, u64 start, u64 len);
struct btrfs_ordered_extent *
btrfs_lookup_first_ordered_extent(struct btrfs_inode *inode, u64 file_offset);
struct btrfs_ordered_extent *btrfs_lookup_first_ordered_range(
struct btrfs_inode *inode, u64 file_offset, u64 len);
struct btrfs_ordered_extent *btrfs_lookup_ordered_range(
struct btrfs_inode *inode,
u64 file_offset,
u64 len);
void btrfs_get_ordered_extents_for_logging(struct btrfs_inode *inode,
struct list_head *list);
u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr,
const struct btrfs_block_group *bg);
void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr,
const struct btrfs_block_group *bg);
void btrfs_lock_and_flush_ordered_range(struct btrfs_inode *inode, u64 start,
u64 end,
struct extent_state **cached_state);
bool btrfs_try_lock_ordered_range(struct btrfs_inode *inode, u64 start, u64 end,
struct extent_state **cached_state);
struct btrfs_ordered_extent *btrfs_split_ordered_extent(
struct btrfs_ordered_extent *ordered, u64 len);
void btrfs_mark_ordered_extent_error(struct btrfs_ordered_extent *ordered);
int __init ordered_data_init(void);
void __cold ordered_data_exit(void);
#endif
Codebase Browser
linux